Lean

@leanprover

Lean is a dependently-typed programming language and theorem prover.

Seattle

lean-lang.org

Replies Reposts Media

Lean
@leanprover
Aug 25
We're excited to be working with @SAIRfoundation on the Lean Kernel Challenge. More info below. #LeanLang #LeanProver
SAIR
@SAIRfoundation
Aug 25
SAIR's next competition has arrived: the Lean Kernel Challenge, co-organized with @leanprover. Improve the performance of verified computation in the Lean 4 kernel that the whole community can benefit from. Stage 1 pre-registration is open. Official launch: Sep 15.
Lean
@leanprover
Aug 21
The Lean FRO Year 4 Part 1 roadmap, covering September 2026 through February 2027, is now published. It sets out our priorities for Lean and ecosystem support for the first half of our fourth year of operations. 🔗 Read the full roadmap here: lean-lang.org/fro/roadmap/y4… #LeanLang
Lean
@leanprover
Aug 19
See Kim Morrison's (@tqft) post and resources below about the newly announced Palomar Registry.
tqft
@tqft
Aug 19
Today we're launching the Palomar registry at palomar-registry.org, an index of formalized mathematics results. If you have a GitHub repo with some maths, and can set up github.com/leanprover/com… for verification and github.com/mathlib-initia… for metadata, please submit!
Lean
@leanprover
Aug 18
Great news for the Lean ecosystem! We're thrilled that CSLib has the formal backing of @RenPhilanthropy.
Renaissance Philanthropy
@RenPhilanthropy
Aug 18
We're delighted to announce the launch of the CSLib Initiative, a new fund at @RenPhilanthropy. CSLib is an open-source library formalizing computer-science theory in the Lean proof assistant — aiming to be for computer science what Mathlib has become for mathematics. Read
Lean
@leanprover
Aug 13
The Lean Kernel Arena is a public benchmarking site for Lean proof checkers. Anyone can build an independent Lean kernel. The Arena runs them all against the same suite: valid proofs each should accept, invalid proofs each should reject, plus timing and memory on Mathlib and the